[c-nsp] Cisco 7206VXR OSPF

[Ben Steele]

Are any other hosts affected off the switch during this period aswell?

Ben
On 13/03/2008, at 8:05 AM, Jason Berenson wrote:

> Rodney,
>
> They connect back to a cisco switch.  No errors anywhere along the
> ethernet and no packet loss.  It also only flapped 3 times yesterday  
> and
> 2 times 5 days ago, so it's not a constant flap.
>
> It hasn't flapped yet today, so I'll turn on debugging and setup a  
> snoop
> and write back when I have something.  About the debugging - will
> turning on the commands suggested (ospf event or ospf adj)  have an
> averse affect on the routers performance?
>
> Thanks,
> Jason
>
> Rodney Dunn wrote:
>> What is the physical topology?
>>
>> Is it back to back ethernet?
>>
>> On Wed, Mar 12, 2008 at 11:37:42AM -0400, Jason Berenson wrote:
>>
>>> Joe,
>>>
>>> I checked the neighbors too.  I do see the session flap there but  
>>> again,
>>> no errors on the ethernet and nothing really obvious as to why it
>>> flapped.  This just started in the past few days.  I do see some CPU
>>> spikes to 100% but it doesn't correlate exactly to when the flap  
>>> occurred.
>>>
>>> -Jason
>>>
>>> Joe Freeman wrote:
>>>
>>>> If OSPF is flapping, you should see it on the neighbor attached to
>>>> that interface as well, so you might look there for issues.
>>>>
>>>> Joe
>>>>
>>>> On 3/12/08, *Jason Berenson* <jason at pins.net  
>>>> <mailto:jason at pins.net>>
>>>> wrote:
>>>>
>>>>   Rodney,
>>>>
>>>>   The interface is clean.  No errors/drops at all.  I think I'll  
>>>> have to
>>>>   snoop that segment like you suggested and wait for it to flap  
>>>> again.
>>>>
>>>>   Thanks,
>>>>
>>>>   Jason
>>>>
>>>>
>>>>   Rodney Dunn wrote:
>>>>> Look for intput drops on the 'sh int'.
>>>>>
>>>>> If you don't see any you probably need a sniffer trace on the
>>>>> ethernet segment.
>>>>>
>>>>> On Tue, Mar 11, 2008 at 03:53:30PM -0400, Jason Berenson wrote:
>>>>>
>>>>>> Greetings,
>>>>>>
>>>>>> We have a few 7206's running OSPF/BGP for routing.  All of the
>>>>   routers
>>>>>> are fine except for one - I noticed a few times in the past
>>>>   week where
>>>>>> OSPF/BGP flapped and came back right away.
>>>>>>
>>>>>> I checked CPU and noticed it peaked in the past hour but that
>>>>   doesn't
>>>>>> really correlate to the time the routing sessions flapped.  I  
>>>>>> also
>>>>>> didn't see the ethernet connection go down and I don't see any
>>>>   errors on
>>>>>> either side of the ethernet.
>>>>>>
>>>>>> If there are any outputs anyone would expect please let me know
>>>>   and I'll
>>>>>> promptly reply.  This is the first time I'm faced with a
>>>>   problem like
>>>>>> this so I'm not really sure where to look other then the things
>>>>   I've
>>>>>> already tried.
>>>>>>
>>>>>> Much thanks in advance,
>>>>>> Jason Berenson
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